[The study of effects of geomagnetic disturbances at high latitudes on the intrauterine condition of fetus by cardiotocography]. / Issledovanie vozdeistviia geomagnitnykh vozmushchenii v vysokikh shirotakh na vnutriutrobnoe sostoianie ploda metodom kardiotokografii.

The effect of geomagnetic disturbances on the intrauterine condition of the fetus in high latitudes was studied by comparing the index of fetus condition (IFC) with the heliogeophysical indices (planetary Kp index and Dst variation index). The functional state of fetus at late terms of pregnancy was assessed by the method of cardiomonitoring. The data of fetal cardiomonitoring were processed by the method of Prof. Demidov by calculating the integral IFC using a computer program. It was found that the variations in maximum IFC values (approximately 15% of the total number of cases) coincide with seasonal variations in geomagnetic disturbances. The maximum values of IFC were observed at the equinox (March-April-May, October-November), and the minimum values were registered in the period of the solstice. A comparison of IFC values with the indices of geomagnetic disturbances indicated that the IFC value was maximum in the periods of either the greatest weakening of geomagnetic activity or maximum disturbances.